Vacuum flask



FIG. 1 is a perspective view of vacuum flask showing our new design thereof;

FIG. 2 is a right side elevational view of FIG. 1;

FIG. 3 is a top plan view of FIG. 1;

FIG. 4 is a front elevational view and the rear elevational view being a mirror image of FIG. 1;

FIG. 5 is a bottom plan view of FIG. 1;

FIG. 6 is a left side elevational view of FIG. 1;

FIG. 7 is a perspective view of vacuum flask of an alternate embodiment thereof, the only difference residing in the handle of the article;

FIG. 8 is a right side elevational view of FIG. 7;

FIG. 9 is a top plan view of FIG. 7;

FIG. 10 is a front elevational view and the rear side elevational view being a mirror image of FIG. 7;

FIG. 11 is a bottom plan view of FIG. 7; and,

FIG. 12 is a left side elevational view of FIG. 7. 

The ornamental design for vacuum flask, as shown and described. 